Pay the house off, put some money into it to boost its value, sell it and buy/build something on a nice piece of land somewhere in the Cascade range close by a nice river that I could hear with the windows open at night. It’d be made out of solid wood and stone, with a big movie theater and a music room that has an offshoot with an atrium where a 9ft Bösendorfer would sit. An indoor glass green room/garden with cat-friendly plants where the little dude can run amok and feel like he’s outside.
Set up a healthy nest egg for the immediate family and kid with schooling and beyond, but have the latter only accessible after he establishes himself enough to be financially stable in his own. Not that I wouldn’t help if he needed it, but wouldn’t want to let him think I’m an ATM. He’s already showing more creativity than me at six so he’d probably do well with it somehow.
Put about 50 or so million aside in a Roth or something that grows without any early withdrawal penalties and use some of it for various charitable endeavors that help make the world a better place via environmentally, medically, technologically, etc. Humanitarian type stuff. Maybe even a smaller videogame studio that shows promise for fun. Probably would have a lot left over still to sit on, so maybe travel to a few of those beautiful places I only see on TV or r/earthporn. Maybe buy some more land at one of them if it really speaks to me, if it’s even an option.
Oh, probably also buy the wife something nice now and then too.